Net Loss Per Share Attributable to Common Stockholders - Schedule of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator
Net loss attributable to common stockholders	$ (3,225)	$ (14,099)	$ (14,948)	$ (7,324)	$ (10,300)	$ 5,732	$ (32,272)	$ (11,892)
Denominator:
Weighted-average common stock outstanding	2,798,146			999,091			2,145,733	946,576
Net loss per share attributable to common stockholders, basic and diluted	$ (1.15)			$ (7.33)			$ (15.04)	$ (12.56)